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1. The engineers carry out the experiments with new building materials
2. The electronic computer will make our travel in high speed train safer
3. At present chemists are developing new materials
4. The first railway in our country was electrified in 1926
1. The engineers carry out the experiments with new building materials
2. The electronic computer will make our travel in high speed train safer
3. At present chemists are developing new materials
4. The first railway in our country was electrified in 1926
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2. Will the electronic computer make our travel in high speed train safer?
3. Are chemists developing new materials at present?
4. Was the first railway in our country electrified in 1926?
1. The engineers do not carry out the experiments with new building materials
2. The electronic computer will not make our travel in high speed train safer
3. At present chemists are not developing new materials
4. The first railway in our country was not electrified in 1926.